[Mark Smith] must really, really like his coffee, at least judging by how much effort he’s put into tricking out his espresso machine. Directly adjacent to the float track on the outside of the tank ...

Sometimes we need a non-contact liquid level sensor. There are several ways to build that, but the easiest is to try an optical liquid level sensor. You may already have an idea in mind since you are ...

A common way of measuring the level of liquid in a tank places a low-pressure sensor at the bottom. The pressure readout is the product of the liquid column height times the density of the liquid. As ...